[mpiwg-tools] Questions for the tools community

[schulzm at in.tum.de]

Hi Jeff,

Due to the summer break and vacation time, especially in Europe, we haven’t had a chance to address this - Marc-Andre had suggested a tools call on this for after EuroMPI and then we’ll know more (we need to get tool implementors to the table who are not part of the WG). 

Personally, though, I fear you are right with your assumption, but I am happy to be proven wrong.

Martin


—
Prof. Dr. Martin Schulz, Chair of Computer Architecture and Parallel Systems
Department of Informatics, TU-Munich, Boltzmannstraße 3, D-85748 Garching
Member of the Board of Directors at the Leibniz Supercomputing Centre (LRZ)
Email: schulzm at in.tum.de








> On 29. Aug 2019, at 16:46, Jeff Squyres (jsquyres) via mpiwg-tools <mpiwg-tools at lists.mpi-forum.org> wrote:
> 
> Should I infer from the lack of reply that no tools properly handle either Fortran descriptors or the descriptor-based symbols?
> 
> 
> 
>> On Aug 25, 2019, at 11:31 AM, Jeff Squyres (jsquyres) via mpiwg-tools <mpiwg-tools at lists.mpi-forum.org> wrote:
>> 
>> In Open MPI, we are finally working towards supporting Fortran descriptors for choice buffers (i.e., "TYPE(*), DIMENSION(..)").
>> 
>> Per MPI-3.1 p613 table 17.1, this means ***changing all the back-end symbols*** that are used for PMPI-style interception.
>> 
>> A concrete example:
>> 
>> - in mpif.h / the mpi module, MPI_SEND will become MPI_SEND_FTS
>> - in the mpi_f08 module, MPI_SEND will become MPI_SEND_F08TS
>> 
>> I.e., anywhere the application calls MPI_SEND, it will be transmogrified to either MPI_SEND_FTS or MPI_SEND_F08TS.  And the choice buffer passed will be a descriptor (which may therefore be a subarray, not a contiguous buffer), not a naked pointer.
>> 
>> Here's my questions:
>> 
>> 1. Do any tools support Fortran descriptors as choice buffers?
>> 2. Do any tools intercept the symbols as described in MPI-3.1 table 17.1?
>> 
>> -- 
>> Jeff Squyres
>> jsquyres at cisco.com
>> 
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> 
> 
> -- 
> Jeff Squyres
> jsquyres at cisco.com
> 
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